The studied material comprised 21 hybrids generated by crossing seven diverse lines of lentil (Lens culinaris M.) in diallel mating design. The set of 21 hybrids and parents were evaluated in randomized block design with three replications to study the gene action for yield and its attributing traits. The component analysis indicated preponderance of dominance gene action in the inheritance of all the traits studied. The value of H2/4H1 was less than 0.25 for all the characters studied indicating the asymmetrical distribution of positive and negative alleles in the parents. The ratio (4DH1)0.5+F/(4DH1)0.5 –F was greater than unity for all the traits under study indicating presence of excess of dominant genes in the parents. Heritability was observed to be moderately low for most of the traits. The graphical analysis indicated importance of overdominance and positions of parental arrays in the graphs were scattered suggesting parental diversity for the various traits studied.